JP2013050074A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly-effective hermetic compressor that reduces an increase in the temperature of refrigerant gas passing through a suction muffler by cooling a side surface of the suction muffler adjacent to a motor element using refrigerant gas returning from a suction pipe.SOLUTION: The hermetic compressor includes the suction muffler 159 provided with a muffler body 167 defining a sound deadening space 165 and a tail tube 161 for introducing refrigerant gas into a muffler body 167. In addition, the arrangement of a part of an opening 119 of the suction pipe 117 at a position opposite to a space between the suction muffler 159 and the motor element 105 allows a part of low-temperature refrigerant gas from the opening 119 of the suction pipe 117 to pass through the space between the suction muffler 159 and the motor element 105 to cool a side surface of the suction muffler 159 adjacent to the motor element 105. As a result, this configuration can reduce an increase in the temperature of refrigerant gas 113 passing through the suction muffler 159, and improving the volumetric efficiency and increasing the efficiency of the hermetic compressor.

Description

  The present invention relates to a suction compressor for a hermetic compressor used in a home electric refrigerator-freezer, a showcase, and the like.

  In recent years, the demand for protection of the global environment has increased, and there is a strong demand for higher efficiency in hermetic compressors used in household electric refrigerator-freezers and other refrigeration cycle devices.

  Conventionally, this type of hermetic compressor has been provided with a muffler enclosure extending to the side of the hermetic container including the suction port that opens to the hermetic container side of the suction muffler, and the suction pipe is located inside the muffler enclosure. (For example, refer to Patent Document 1).

  6 is a front sectional view of a conventional hermetic compressor described in Patent Document 1, FIG. 7 is a side sectional view of a conventional hermetic compressor described in Patent Document 1, and FIG. It is a plane sectional view of the conventional hermetic compressor indicated in patent documents 1.

  As shown in FIGS. 6 to 8, in the conventional hermetic compressor, the hermetic container 3 is filled with the refrigerant gas 5, and the compressor main body 7 is elasticated in the hermetic container 3 by a suspension spring (not shown). Is supported.

  The compressor body 7 includes an electric element 11 and a compression element 13 disposed below the electric element 11, and the electric element 11 includes a stator 15 and a rotor 17.

  The compression element 13 includes a block 21 integrally formed with a cylinder 19, a piston 23 that reciprocates in the cylinder 19, a valve plate 25 that seals the end surface of the cylinder 19, a cylinder head 27 that covers the valve plate 25, An intake muffler 29, a crankshaft 35 having an eccentric shaft 31 and a main shaft 33, and connecting means 37 for connecting the eccentric shaft 31 and the piston 23 are provided.

  A compression chamber 39 is formed by the cylinder 19, the valve plate 25, and the piston 23.

  Further, the suction muffler 29 is sandwiched and fixed by the valve plate 25 and the cylinder head 27.

  The suction muffler 29 is molded with a resin such as PBT, and includes a muffler body 41 that forms a silencing space, a suction port 43 that is provided in the muffler body 41 and opens on the side surface of the sealed container 3, and a suction port 43. The muffler enclosure 45 extended to the airtight container 3 side is comprised by the outer periphery of the airtight container 3 side including.

  The sealed container 3 includes a suction pipe 47 that communicates between the inside and the outside of the sealed container 3, and the suction pipe 47 is opened at a position facing the muffler enclosure 45.

JP 2003-97430 A

  In the conventional configuration, the low-temperature refrigerant gas 5 returned from an external refrigeration cycle (not shown) flows into the sealed container 3 through the suction pipe 47, and then the suction port 43 to which most of the refrigerant gas 5 faces. The other portion is directly sucked into the muffler main body 41, and the other is temporarily retained between the side surface of the suction muffler 29 on the side of the sealed container 3 and the sealed container 3 by the muffler enclosure 45 and then sucked from the suction port 43.

  Therefore, the refrigerant gas 5 sucked into the muffler main body 41 does not touch the high-temperature compressor main body 7, and is sucked in at a low temperature with almost no increase in temperature. Further, since the side surface of the suction muffler 29 on the side of the sealed container 3 can be cooled by the low-temperature refrigerant gas 5 staying in the muffler enclosure 45, the rise in the temperature of the refrigerant gas 5 passing through the muffler body 41 can be reduced. it can.

  However, in the above-described conventional configuration, the side surface of the suction muffler 29 on the electric element 11 side is exposed to the high temperature electric element 11 and receives heat from the electric element 11, and the refrigerant gas 5 that has reached a high temperature is combined with the electric element 11 and the suction muffler. Since it stays between the 29 side surfaces of the electric element 11, the side surface of the suction muffler 29 on the electric element 11 side is heated.

  As a result, the refrigerant gas 5 passing through the muffler main body 41 is greatly affected by the heat received from the side surface of the electric element 11 and increases in temperature, so that the cooling effect on the side surface of the suction muffler 29 on the sealed container 3 side is sufficiently increased. There was a problem that volume efficiency could not be greatly improved because it could not be fully utilized.

  The present invention solves the above-described conventional problems, by guiding a part of the return refrigerant gas from the suction pipe to the electric element side side surface of the suction muffler, thereby cooling the electric element side side surface of the suction muffler. An object of the present invention is to provide a highly efficient hermetic compressor by reducing the temperature rise of the refrigerant gas passing through the suction muffler.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention is arranged such that a part of the opening of the suction pipe that opens into the hermetic container is opposed to the gap between the suction muffler and the electric element. Is.

  As a result, a part of the low-temperature refrigerant gas that has flowed into the sealed container from the opening of the suction pipe passes through the gap between the suction muffler and the electric element, and the side surface of the suction muffler on the electric element side is cooled, and the inside of the suction muffler Since the temperature rise of the refrigerant gas passing through can be reduced, the volumetric efficiency can be improved.

  The hermetic compressor of the present invention can reduce the temperature rise of the refrigerant gas passing through the suction muffler and improve the volumetric efficiency, so that the efficiency of the hermetic compressor can be increased.

1 is a longitudinal sectional view of a hermetic compressor according to Embodiment 1 of the present invention. Cross-sectional view seen from the bottom of the hermetic compressor in the first embodiment Vertical sectional view of a hermetic compressor according to Embodiment 2 of the present invention Cross-sectional view seen from the bottom of the hermetic compressor in the second embodiment Sectional drawing of the suction muffler having a different configuration in the second embodiment Front sectional view of a conventional hermetic compressor Side sectional view of a conventional hermetic compressor Plan sectional view of a conventional hermetic compressor

  According to a first aspect of the present invention, an electric element and a compression element driven by the electric element are accommodated in a sealed container, and further, the suction pipe having one end opened to the space in the sealed container, A discharge pipe for guiding the refrigerant gas compressed by the compression element to the outside of the sealed container is provided, and a suction muffler for guiding the return refrigerant gas from the suction pipe to the compression chamber of the compression element is provided in the compression element. A muffler body that forms a muffler space, a communication pipe that communicates the muffler space and a compression chamber of the compression element, and a tail pipe that introduces the refrigerant gas into the muffler body, and further includes an opening of the suction pipe A part of the portion is arranged so as to face a gap between the suction muffler and the electric element.

  As a result, part of the low-temperature refrigerant gas that has flowed into the sealed container from the opening of the suction pipe passes through the gap between the suction muffler and the electric element. As a result, the side surface of the suction muffler on the electric element side is cooled, and the temperature rise of the refrigerant gas passing through the suction muffler can be reduced. Therefore, volume efficiency can be improved and the efficiency of the hermetic compressor can be increased.

  According to a second aspect of the present invention, in the first aspect of the present invention, in the first aspect of the present invention, a suction opening that opens into the space in the sealed container provided at one end of the tail pipe of the suction muffler is provided near the opening of the suction pipe, and It arrange | positions facing a part of opening part.

  As a result, the low-temperature refrigerant gas flowing into the sealed container from the opening of the suction pipe is sucked into the suction muffler at a low temperature before coming into contact with the high-temperature electric element or compression element. In addition, the volumetric efficiency can be further improved.

  According to a third aspect of the present invention, in the second aspect of the present invention, in the second aspect of the present invention, a refrigerant receiver is provided at the inlet of the suction muffler so as to face the opening of the suction pipe. A refrigerant introduction port that communicates with the outer wall and guides a part of the refrigerant gas that has flowed into the refrigerant receiving portion to the outer wall on the electric element side is provided.

  As a result, the refrigerant that has flowed into the sealed container from the opening of the suction pipe is once received by the refrigerant receiver, and then the refrigerant gas that is sucked into the suction muffler and the refrigerant that flows into the gap between the suction muffler and the electric element The diversion ratio with the gas can be controlled. Therefore, in addition to the effect of the second invention, the outer wall on the electric element side of the suction muffler can be effectively cooled without extremely reducing the refrigerant gas sucked into the compression chamber. As a result, the volumetric efficiency can be further improved and the efficiency of the hermetic compressor can be increased.

  In a fourth aspect of the invention, in particular, in any one of the first to third aspects of the invention, a refrigerant passage through which refrigerant gas passes is provided on the outer wall of the suction muffler on the electric element side.

  As a result, the refrigerant gas passing through the suction muffler and the high-temperature refrigerant gas staying in the gap between the suction muffler and the electric element can be cut off, and the temperature rise of the refrigerant gas passing through the suction muffler can be reduced. . Therefore, in addition to the effect of any one of the first to third inventions, the volumetric efficiency can be further improved and the efficiency of the hermetic compressor can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a hermetic compressor according to the first embodiment of the present invention, and FIG. 2 is a transverse sectional view of the hermetic compressor according to the first embodiment as viewed from the bottom.

  1 and 2, the hermetic compressor according to the first embodiment includes an electric element 105 and a compression element 107 driven by the electric element 105 inside a hermetic container 103 formed by drawing a steel plate. A compressor main body 109 is mainly arranged. The compressor body 109 is elastically supported by a suspension spring 111.

  Further, for example, a refrigerant gas 113 such as a hydrocarbon-based R600a having a low global warming potential is sealed in the sealed container 103, and lubricating oil 115 is sealed in the bottom of the sealed container 103. Yes.

  The sealed container 103 is provided with a suction pipe 117 that communicates the inside and outside of the sealed container 103, and one end of the suction pipe 117 is an opening 119 that opens into the sealed container 103.

  The compression element 107 includes a crankshaft 121, a block 123, a piston 125, connecting means 127, and the like. The crankshaft 121 includes an eccentric shaft 129, a main shaft 131, and an oil supply mechanism 133 that communicates from the lower end of the main shaft 131 immersed in the oil 115 to the upper end of the eccentric shaft 129, and the middle is provided on the surface of the main shaft 131. It is constituted by a spiral groove or the like.

  The compression element 107 is connected to a high-pressure pipe 137 for flowing the refrigerant gas 113 compressed by the reciprocating motion of the piston 125 to the discharge pipe 135 fixed to the sealed container 103.

  The electric element 105 includes a stator 139 fixed below the block 123 by bolts (not shown), a rotor arranged coaxially with the stator 139 inside the stator 139, and fixed to the main shaft 131 by shrink fitting. 141.

  The block 123 is integrally formed with a cylinder 145 that forms a compression chamber 143, and includes a bearing portion 147 that rotatably supports the main shaft 131.

  Further, on the end surface of the cylinder 145, there are a valve plate 151 having a suction hole 149 and a discharge hole (not shown), a suction valve 153 for opening and closing the suction hole 149, and a cylinder head 155 covering the valve plate 151. The bolt 157 is fastened together so as to seal the end face of the cylinder 145 on the side opposite to the crankshaft 121. Further, the suction muffler 159 is sandwiched and fixed by the valve plate 151 and the cylinder head 155.

  The suction muffler 159 is mainly molded from a synthetic resin such as PBT to which glass fiber is added, and the tail pipe 161 that guides the refrigerant gas 113 into the suction muffler 159, and the refrigerant gas 113 in the suction muffler 159 is put into the compression chamber 143. It has a communication pipe 163 for guiding, and a muffler body 167 that forms a silencing space 165.

  One end of the tail tube 161 communicates with the sound deadening space 165, and the other end includes an inlet 169 that opens into the sealed container 103. Further, the suction port 169 is disposed in the vicinity of the opening 119 of the suction pipe 117.

  In addition, the opening 119 of the suction pipe 117 is shifted from the suction port 169 toward the stator 139 side.

  2 indicates the flow of the refrigerant gas 113.

  The operation and action of the hermetic compressor configured as described above will be described below.

  The hermetic compressor has a discharge pipe 135 and a suction pipe 117 connected to a refrigeration apparatus (not shown) having a well-known configuration to constitute a refrigeration cycle.

  In this configuration, when the electric element 105 is energized, a current flows through the stator 139 to generate a magnetic field, and the rotor 141 fixed to the main shaft 131 rotates. The rotation causes the crankshaft 121 to rotate, and the piston 125 reciprocates in the cylinder 145 via the connecting means 127 that is rotatably attached to the eccentric shaft 129.

  As the piston 125 reciprocates, the refrigerant gas 113 is sucked into the compression chamber 143 through the suction muffler 159, and after being compressed, flows through the high-pressure pipe 137 and flows into the discharge pipe 135. And it circulates through the piping path | route (not shown) of a freezing apparatus.

  Next, the suction stroke of the hermetic compressor will be described.

  When the piston 125 moves in the direction of increasing the volume of the compression chamber 143, the refrigerant gas 113 in the compression chamber 143 expands. When the pressure in the compression chamber 143 falls below the suction pressure, the suction valve 153 starts to open due to the difference between the pressure in the compression chamber 143 and the pressure in the suction muffler 159.

  Along with this operation, the low-temperature refrigerant gas 113 returned from the refrigeration apparatus is once opened into the sealed container 103 from the opening 119 of the suction pipe 117, and then sucked from the suction port 169 of the suction muffler 159, and the tail pipe 161 is introduced into the silencing space 165. The introduced refrigerant gas 113 flows into the compression chamber 143 through the communication pipe 163.

  Thereafter, when the operation of the piston 125 changes from the bottom dead center in a direction in which the volume in the compression chamber 143 decreases, the refrigerant gas 113 in the compression chamber 143 is compressed, and the pressure in the compression chamber 143 increases. The suction valve 153 is closed by the difference between the pressure in the compression chamber 143 and the pressure in the suction muffler 159.

  Here, the suction muffler 159 is often disposed in the vicinity of the stator 139 in which the space is easily secured in the sealed container 103 in order to secure a sufficient volume of the muffler main body 167. Therefore, the side surface of the muffler main body 167 on the stator 139 side is heated by the heat generated by the stator 139. As a result, the refrigerant gas 113 introduced into the muffler space 165 is heated via the side surface of the muffler body 167 on the stator 139 side, and the temperature rises.

  When the tail pipe 161 is disposed on the stator 139 side as in the first embodiment, the refrigerant gas 113 is heated from the stage of passing through the tail pipe 161, and the temperature rises.

  When the temperature of the refrigerant gas 113 flowing into the compression chamber 143 increases, the density of the refrigerant gas 113 flowing into the compression chamber 143 decreases, and the volume efficiency deteriorates.

  However, in the present embodiment, the opening 119 of the suction pipe 117 is shifted from the suction port 169 toward the stator 139, so that the suction muffler 159, the stator 139, and the like as shown by the arrows in FIG. The refrigerant gas 113 also flows into this gap, and the side surface of the muffler body 167 on the stator 139 side is cooled.

  As a result, the temperature rise of the refrigerant gas 113 passing through the tail pipe 161 and the silencing space 165 can be reduced, the volumetric efficiency can be improved, and the efficiency of the hermetic compressor can be increased.

  Further, the suction port 169 of the tail pipe 161 is disposed in the vicinity of the opening 119 of the suction pipe 117 and is opposed to a part of the opening 119, so that the low-temperature opening opened from the opening 119 into the hermetic container 103. A part of the refrigerant gas 113 can be introduced into the suction muffler 159 before being heated by the hot compressor body 109. As a result, the volumetric efficiency can be improved more effectively, and the efficiency of the hermetic compressor can be increased.

(Embodiment 2)
FIG. 3 is a longitudinal sectional view of the hermetic compressor according to the second embodiment of the present invention, and FIG. 4 is a transverse sectional view seen from the bottom of the hermetic compressor according to the second embodiment. Note that the hermetic compressor of the second embodiment is based on the configuration of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals. Here, The contents different from those of the first embodiment will be mainly described.

  3 and FIG. 4, the suction muffler 259 of the second embodiment is molded mainly from a synthetic resin such as PBT to which glass fibers are added, and a tail pipe 261 that guides the refrigerant gas 113 into the suction muffler 259, and a suction pipe. A communication pipe 263 that guides the refrigerant gas 113 in the muffler 259 into the compression chamber 143, a muffler main body 267 that forms a muffler space 265, and a passage cover 273 that forms a refrigerant passage 271 on the outer wall of the muffler main body 267 on the stator 139 side. Have.

  The tail pipe 261 has one end communicating with the sound deadening space 265 and the other end provided with a suction port 269 that opens into the sealed container 103. Further, the suction port 269 includes a refrigerant receiving portion 275 that faces the opening 119 of the suction pipe 117. The refrigerant receiver 275 is provided with a refrigerant inlet 277 for introducing the refrigerant gas 113 to the refrigerant passage 271, and the passage cover 273 has a refrigerant outlet 279 on the opposite side of the refrigerant inlet 277.

  Note that the arrows in FIG. 4 indicate the flow of the refrigerant gas 113.

  Since the operation of the hermetic compressor configured as described above and the path of the refrigerant gas 113 flowing through the suction muffler 259 accompanying this operation are substantially the same as those in the first embodiment, The description of the first embodiment is used and the description here is omitted.

  In the present embodiment, the refrigerant gas 113 released into the sealed container 103 from the opening 119 of the suction pipe 117 once flows into the refrigerant receiving portion 275 facing the opening 119, and then shown in FIG. As indicated by the arrow, the refrigerant is distributed to the tail tube 261 and the refrigerant inlet 277.

  Then, the refrigerant gas 113 distributed to the refrigerant introduction port 277 passes through the refrigerant passage 271, cools the side surface of the muffler main body 267 on the stator 139 side, and is then discharged into the sealed container 103 from the refrigerant discharge port 279. .

  As a result, the temperature rise of the refrigerant gas 113 passing through the tail pipe 261 and the silencing space 265 is reduced, the volumetric efficiency can be improved, and the efficiency of the hermetic compressor can be increased.

  Further, since the refrigerant gas 113 passing through the refrigerant passage 271 does not touch the stator 139, the side surface of the muffler body 267 on the stator 139 side can be cooled more effectively.

  Furthermore, the amount of the refrigerant gas 113 flowing into the refrigerant passage 271 can be controlled by changing the cross-sectional area ratio between the tail pipe 261 and the refrigerant introduction port 277. As a result, the side surface on the stator 139 side of the muffler main body 267 can be effectively cooled without significantly reducing the amount of the refrigerant gas 113 sucked into the compression chamber 143, and an effect of improving the volume efficiency can be obtained.

  Here, in the suction muffler 259 shown in FIGS. 3 and 4, the passage cover 273 is configured to cover the entire side surface of the muffler main body 267 on the stator 139 side, but as shown in FIG. 5, the tail pipe of the suction muffler 359 is provided. The refrigerant passage 371 may be provided only on the side surface of the 361 on the stator 139 side.

  In the configuration of the suction muffler 359, the temperature difference of the refrigerant gas 113 that passes through the tail pipe 361 that has the largest temperature difference from the stator 139 and is likely to receive heat can be effectively suppressed.

  Furthermore, the refrigerant passage 371 and the muffler main body 367 can be molded integrally, so that volume efficiency can be improved without increasing the number of parts, and productivity can be improved.

  As described above, the hermetic compressor according to the present invention can increase the refrigerant gas suction efficiency and improve the efficiency of the compressor, so that it is not limited to household use such as an electric refrigerator or an air conditioner. It can be widely applied to refrigeration equipment such as showcases and vending machines.

103 Sealed Container 105 Electric Element 107 Compression Element 113 Refrigerant Gas 117 Suction Pipe 119 Opening 135 Discharge Pipe 143 Compression Chamber 159 Suction Muffler 161 Tail Pipe 163 Communication Pipe 165 Silence Space 167 Muffler Body 169 Suction Port 259 Suction Muffler 261 Tail Pipe 263 Pipe 265 Silent space 267 Muffler body 269 Suction port 271 Refrigerant passage 275 Refrigerant receiving part 277 Refrigerant inlet 359 Suction muffler 361 Tail pipe 367 Muffler body 371 Refrigerant passage

Claims (4)

An electric element and a compression element driven by the electric element are accommodated in the hermetic container. Further, the hermetic container is compressed by the compression element and a suction pipe having one end opened to the inner space of the hermetic container. A discharge pipe that guides the refrigerant gas to the outside of the sealed container is provided, and a suction muffler that guides the return refrigerant gas from the suction pipe to the compression chamber of the compression element is provided in the compression element, thereby forming a silencing space. A muffler body, a communication pipe that communicates the muffler space and the compression chamber of the compression element, and a tail pipe that introduces the refrigerant gas into the muffler body, and a part of the opening of the suction pipe. A hermetic compressor disposed to face a gap between the suction muffler and the electric element. The suction port that opens into the space in the sealed container provided at one end of the tail pipe of the suction muffler is provided in the vicinity of the opening of the suction pipe and is disposed to face a part of the opening of the suction pipe. The hermetic compressor according to 1. A refrigerant receiving portion is provided at the suction port of the suction muffler so as to face the opening of the suction pipe, the refrigerant receiving portion communicates with the outer wall on the electric element side, and flows into the refrigerant receiving portion. The hermetic compressor according to claim 2, further comprising a refrigerant introduction port that guides a part of the refrigerant to an outer wall on the electric element side. The hermetic compressor according to any one of claims 1 to 3, wherein a refrigerant passage through which refrigerant gas passes is provided on an outer wall of the suction muffler on the electric element side.